We guard against that. You get no blue bubble … we don’t display (-55)
Eg:
- post 1
- post 2
- post 3 ← you read till here
- post 4
- post 5
Then:
- post 1
post 2post 3← you read till herepost 4post 5
Nothing is unread for you, no blue bubble.
Then:
- post 1
post 2post 3← you read till herepost 4post 5- post 6
You have 3 unread… you actually only have 1, but that is the cost of the current implementation which can not be improved in any trivial way.